Oil-well packer



July 23, 1929 P. H. MACK 11,722,1Q2

OIL WELL PACKER Filed Feb. 1927 g wento'z Patented July 23, 1929.

UNITED STATES PATENT OFFICE.

PATRICK H. MACK, OF BRADFORD, PENNSYLVANIA, ASSIGNOR TO OIL WELL: SUPPLY COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

OIL-WELL IPACKER.

Application filed February My invention relates to packers for oil and gas wells, and particularly to that type of packers commercially known hook wall packers. A packer of the character stated is shown in United States Letters-Patent No. 1,009,328, granted to me November 21, 1911.

Among the objects of the present invention are: to provide in 'a packer construction of the type mentioned means whereby the gripping portions of the slips when the packcr is set will bear uniformly throughout their length against both the slip expanding means and the wall of the casing in which the packer is being set; to provide the slips with very long neck portions; and to provide straight contact surfaces between the side edges of the necks of the slips and the neck receiving slots or openings of the cage, whereby sand and other substances will not lodge therebetween and interfere with the desired movement of the slips.

In the accompanying drawing, which illustrates an application of my invention:

Fig. 1 is an elevational view of a portion of a packer embodying my invention;

Fig. 2, a detail vertical sectional view, showing a portion of the packer and a casing wall particularly showing the position of the grippin portion of a slip relatively to the wall be ore expansion;

Fig. 3, a view similar to Fig. 2, showing the position of a slip after expansion;

Fig. 4, a cross sectional'view taken on lin 1VIV of Fig. 1; and

Fig. 5, a cross sectional view taken on line V-V of Fig. 1. v

As the present invention I'Qates only to the cage and slip construction of hookwall packers, I have deemed it unnecessary to show a complete packer of this type; for the parts of the packer not shown reference may be had to my Patent No. 1,009,328 hereinabove referred to.

My invention contemplates the employment of a hollow body member 5 adapted to have its lower end connected with a tubing coupling member 6. It will be understood that the hollow body 5,in addition to coupling 6 and a slip expanding member or sleeve 7, carries at its upper end a coupling, and interposed between the upper coupling and the expanding sleeve 7, a packing elen'lent.

As illustrated, 8 designates the slip-cage designed to carry a plurality of slips 9, said 1,1927. Serial No. 165,098.

slips 9 being loosely connected with the cage so as to have a tilting movement to and from the conical sleeve 7. The slips 9 constitute an important and characteristic feature of the present invention, and, as shown, each in for a portion of their lengths, flat contact faces adapted to contact with straight walls of neck receiving openings formed in the slip-cage.

Each slip is provided at one end, the upper end, with a serrated or gripping portion 12 and at its lower end with outwardly extending lugs 13 for tiltingly engaging the lower end of the slip with the slip-cage. Each lug 13 is preferably formed with a beveled face 14 designed to cooperate with beveled walls of the slip-cage, as hereinafter described.

The long neck 10 of the slip is formed with outwardly extending flanges 15, thereby forming a groove or channel 16 for the reception of a spring member 17, said spring'member 17 being secured at one end to the slipcage by rivets, as shown at 18. portion 10 is bent inwardly slightly as it approaches the serrated portion 12, as shown at 19.

The slip-cage 8, as illustrated and as pre- The neck ferred, comprises an upper annular slotted the several slip members or the neck portions 10 thereof. The verticallyextending walls 23 of the openings 22 are formed straight or unbeveled to engage the unbeveled vertically extending edges 11 of the neck 10. These straight contacting faces 23 and 11, when the parts are assembled, prevent sand and other foreign substances becoming lodged therebetween and interfering with the desired movement of the slips.

24 designates recesses formed in the slipeage. These recesses are adapted to receive the lugs 13 of the neck portion 10. It will be noted that the vertically extending walls of the said recesses are beveled to correspond with the beveled faces 14 of the lugs. This, will prevent the lugs from being forced out- Wardly through the said recesses. In order 13 within the recesses, the recesses are of sufficient depth to allow for. a slight vertical movement of the lugs therein.

The lower ring portion of the slip-cage is provided with hooks 25 for engagement with a pin or member 26 carried by the body 5. This last mentioned construction is similar to the constructf on shown in my Patent No. 1,009,327 aforesaid.

The position of the hooks and the pin or lug 26 shown by Fig. 1 are such as to maintain the slips in inoperative position. In order that the slips may be expanded against the casing, the lug or pin 26 must be free of the hooks 25; this is accomplished by rotation of the tubing to which the packer is attached and in turn by the rotation of the hollow body 5.

By the provision of the long neck portion 10, I provide a construction that will permit the desired contact of the serrated portion between the expanding member and the casing, when the packer is set, throughout the length of the serrated portion, that is impossible where the neck portion is short as in constructions heretofore made. The length of the neck portion 10 should be such as to permit of adjustment between the parts for the purpose stated.

It will be noted with a long neck, as shown, the angularity at the pivoting point between the cage and the lower end of the neck is considerably less than with a short neck, therefore, a full contact of the serrated portion between the expanding means and the casing is assured. A reference to Figs. 2 and 3, shows the position of the serrated portions of the slips before and after'expansion.

Figs. 3 shows the serrated portion after it has been forced outwardly by the sleeve, and it will be noted that it is in close Contact with the casing throughout the length or depth of the serrated portion, and that the face opposite the serrated portion is backed up in close engagement with the expanding member 7.

What I claim is:

1. In an oil well packer, a slip-cage, a slip having a loose connection with the cage, said slip characterized by having a long neck portionwhereby the angularity between the cage and the neck is small upon expansion of the slip, said neck being formed with straight unbeveled edges, said cage having a neck receiving opening therein having straight walls for engaging the straight edges of the neck portion of the slip.

- 2. In an oil well packer, a slip-cage, a slip carrier by and movable relatively to the cage and having a long neck portion formed with straight edges and a lug on its lower end, said lug having an outer tapered face, said cage having a neck receiving opening having straight walls for engaging the straight edges of the neck portion, and a lug receiving recess having a wall thereof beveled to engage the tapered face of the lug.

3. In an oil well packer, a slip-cage, a slip carried by the cage having a serrated gripping portion and a long, relatively rigid neck extending from the gripping portion. said neck adjacent the gripping portion being formed with a bend and with straight contact edges, said cage having a neck receiving opening having straight walls for engaging the straight edges of the neck.

In testimony whereof I afiix my signature.

7 PATRICK H. MACK. 

